Sharp LC-15B2E (serv.man3) Service Manual ▷ View online
13
LC-15B2E
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC801 normal?
Is in/output of
IC1201 normal?
Check IC801
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check IC402
and its
peripheral parts.
Check IC801,
AV1 line and its
peripheral parts.
Check LCD
panel voltages
and waveform.
Yes
Yes
No
No
No picture
at all
Is in/output of
IC402 normal?
Is input at pin
(73) of IC801
normal?
Yes
No
No
No TV and
VIDEO 1
output
Is voltages at
pin (3) of W7
and pins (3), (4)
and (5) of W14
tuner normal?
Is output at pin
(2) of W7 tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
(3) of IC402
normal?
Is the pins (2)
and (4) of IC402
at "H" and "L"
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pins (65)
and (66) of
IC2001 at "H"
and "L" state?
Yes
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is input at pin
(1) of IC402
normal?
Is the pins (2)
and (4) of IC402
at "L" state?
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is the pins (65)
and (66) of IC2001
at "L" state?
Yes
Yes
No
No
No
No VIDEO 1
output
LC-15B2E
14
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is input at pin
(74) of IC801
normal?
Check the AV2
line and their
peripheral parts.
Check the W9,
SY-line, SC-line
and their
peripheral parts.
No
No VIDEO 2
output
Is input at pins
(71) and (72) of
IC801 normal?
No
No S-VIDEO
output
Is input at pin
(70) of IC801
normal?
Check the
V2VO line and
their
peripheral parts.
No
No line
output
Is input at pins
(1), (2), (3), (56),
(57) and (79) of
IC801 normal?
Is output at pins
(11), (13) and
(16) of I4
normal?
Check IC801
and its
peripheral parts.
Check I13 and
its
peripheral parts.
Check I9 and
its
peripheral parts.
Check I4 and
its
peripheral parts.
Is output at pins
(11), (13) and
(16) of I13
normal?
Yes
Yes
No
No
No
No TELETEXT
output
Is output at pins
(44)~(49) of I9
normal?
Yes
No
15
LC-15B2E
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is source GND
normal?
Is CSCOM
waveform
normal?
Check R1212
and its
peripheral parts.
Check IC1109,
Q1101, Q1102,
D1101, R1120,
R1130 and their
peripheral parts.
Check R1231
and its
peripheral parts.
Yes
No
No
Becomes
dark
No
Time passes,
becomes
dark
Is gate GND
normal?
Is gate clock
(GCK) normal?
Check R1223
and gate aray
peripheral parts.
Yes
No
Check D1201
and its
peripheral parts.
No
Is B-5.5V being
outputted?
Is VCC being
outputted?
Check T701's
secondary +5V
outputs line.
Yes
No
Is GSP
waveform
normal?
Check R1223
and its
peripheral parts.
Yes
No
Becomes
white.
Is 3.3V VHS
being
outputted?
Is source clock
normal?
Check +3.3V
outputs line of
IC752.
Check R1210,
R1211 and their
peripheral parts.
Check FB1203
and gate aray
peripheral parts.
Is output of LBR
and HG
normal?
Yes
Yes
No
No
No
Vertical line
output
No picture
Check all the settings microprocessor's adjust process menu.
Is output of
R0~R5
normal?
Is output of
G0~G5
normal?
Is output of
B0~B5
normal?
Check R1202,
R1203 and their
peripheral parts.
Check R1204,
R1205 and their
peripheral parts.
Check R1206,
R1207 and their
peripheral parts.
Check T701's
secondary +5V
outputs line.
Yes
Yes
No
No
Colour is
unusual
Is VLS 5V
being
outputted?
No
Picture
image is
gloomy
Is in/output of
SPIO and
SPOI normal?
Check R1209
and their
peripheral parts.
No
No picture
image
inversion
Is output V0,
V16, V32, V48
and V63
normal?
Check IC1106,
IC1107, IC1108
and their
peripheral parts.
No
Gradation
defect
Is output of U/D
normal?
Check Q1201
and their
peripheral parts.
Yes
No
LC-15B2E
16
No sound
Check all the settins microprocessor's adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(26) and (27) of
IC901 normal?
Is output at pins
(1) and (7) of
IC903 normal?
Yes
Yes
No
No
No
No
No
No sound
from front
speakers
Is output at pins
(1) and (7) of
IC303 normal?
Yes
Is output at pins
(8) and (12) of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and its
peripheral parts.
Check IC903
and its
peripheral parts.
Check IC303
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(26) and (27) of
IC901 normal?
Is output at pins
(1) and (7) of
IC903 normal?
Yes
Yes
No
No
No
No
No
No
Is output at pins
(1) and (7) of
IC303 normal?
Yes
Is output at pins
(8) and (12) of
IC3305 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and its
peripheral parts.
Check IC903
and its
peripheral parts.
Check IC303
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
Yes
Is output at
Q301 normal?
Check Q301
and connection
cable.
No sound
from
headphone
TV sound
failure
Is output at pins
(37) and (38) of
IC901 normal?
Is output at pins
(1) and (7) of
IC902 normal?
Check IC901
and its
peripheral parts.
Check IC902
and its
peripheral parts.
Yes
No
No
No
No sound
from output
line
Is output at pin
(1) of W7 tuner
normal?
Is input at pin
(67) of IC901
normal?
Check the tuner
and its
peripheral parts.
Check IC901,
MONOS/SIF
line and their
peripheral parts.
Yes
No
TROUBLE SHOOTING TABLE
(Continued)
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